N,P and Salt Contents in Hydrophytes in the Bosten Lake,Xinjiang

Some samples of aboveground part of hydrophytes in the Bosten Lake in Xinjiang,China were collected,and the content and composition of seven elements including Na,K,Ca,Mg,Cl,N and P in hydrophytes were analyzed. The results revealed that the capability of accumulating salt( Na,K,Ca,Mg and Cl) content was different from different hydrophytes,it was in an order of submerged plants( 18. 96 ± 8. 81) % floating-leaved plants( 5. 70 ± 0. 20) % emergent plants( 4. 07 ± 1. 78) %,and the salt content in submerged plants was significantly higher than that in floating-leaved plants and emergent plants. N content was the highest in floatingleaved plants( 2. 94 ± 0. 73) %,then in submerged plants( 1. 74 ± 0. 86) %,and it was the lowest in emergent plants( 0. 94 ± 0. 31) %. The average P content ranged from 0. 05% to 0. 10%,and the results of variance analysis showed that the difference of average P content in different hydrophytes was not significant. Salt content in submerged plants was affected by their growth conditions,and it was significantly higher in the large lake area than that in the small lake area of the Bosten Lake. The composition of elements in submerged plants was closely related to water parameters including TN,TP,CODMnand TDS. The composition of elements in different submerged plants was not the same,the salt content in Ceratophyllum demersum was significantly lower than that in Hydrilla verticillata and Potamogeton pectinatus,but its N content was significantly higher than that in the latter two.